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[client] egl: look at 3x3 around the pixel instead of 4x4

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Using 4x4 means that some pixels will be outside of the lanczos window. The
ideal lanczos function should in fact be zero in those areas, so we shouldn't
waste time processing those pixels.

I can't notice any difference in the results.
This commit is contained in:
Quantum 2021-08-15 21:09:48 -04:00 committed by Geoffrey McRae
parent 520460669c
commit bb91b41c64
1 changed files with 6 additions and 13 deletions
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19
client/renderers/EGL/shader/downscale_lanczos2.frag
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@ -29,38 +29,31 @@ void main()
vec2 invSize = 1.0 / size;
vec2 uvc = floor(pos) + vec2(0.5, 0.5);
vec2 uvs[16] = vec2[](
vec2 uvs[9] = vec2[](
uvc + vec2(-1.0, -1.0),
uvc + vec2(-1.0, 0.0),
uvc + vec2(-1.0, 1.0),
uvc + vec2(-1.0, 2.0),
uvc + vec2( 0.0, -1.0),
uvc + vec2( 0.0, 0.0),
uvc + vec2( 0.0, 1.0),
uvc + vec2( 0.0, 2.0),
uvc + vec2( 1.0, -1.0),
uvc + vec2( 1.0, 0.0),
uvc + vec2( 1.0, 1.0),
uvc + vec2( 1.0, 2.0),
uvc + vec2( 2.0, -1.0),
uvc + vec2( 2.0, 0.0),
uvc + vec2( 2.0, 1.0),
uvc + vec2( 2.0, 2.0)
uvc + vec2( 1.0, 1.0)
);
float factors[16];
float factors[9];
float sum = 0.0;
for (int i = 0; i < 16; ++i)
for (int i = 0; i < 9; ++i)
{
factors[i] = lanczos(uvs[i] - fragCoord * size);
sum += factors[i];
}
for (int i = 0; i < 16; ++i)
for (int i = 0; i < 9; ++i)
factors[i] /= sum;
vec3 color = vec3(0.0);
for (int i = 0; i < 16; ++i)
for (int i = 0; i < 9; ++i)
color += texture2D(texture, uvs[i] * invSize).rgb * factors[i];
fragColor = vec4(color, 1.0);